Fisheye image measuring device

Abstract

A fisheye image measuring device with improved detection accuracy is provided. [Solution] The device includes a detection base 1 having a detection part 2 attached to its tip for measurement and detection, a detection base 3 for detection is slidably connected to the tip of the detection base, a loading chamber for loading a film is opened at the tip of the detection base, and positioning parts 5 for reducing wrinkles in the film are symmetrically provided at both ends of the loading chamber, the positioning parts include adjustment slide grooves symmetrically opened at both ends of the loading chamber, an adjustment rod slidably connected to the adjustment slide groove, and a connecting rod attached to one end of the adjustment rod, an extension rod for adjusting the length is slidably connected to one end of the connecting rod, and a positioning rod is provided at the tip of the extension rod. The positioning parts can press and fix the four corners of the film, reducing the situation in which the film locally wrinkles during detection due to the flexibility or low rigidity of the film itself.

Description

[Technical field]

[0001] The present invention relates to the technical field of fisheye image measurement, and in particular to a fisheye image measurement device. [Background technology]

[0002] Fisheye lenses have the advantages of ultra-wide viewing angle, small size and compact structure, and are therefore a method that can be applied to wide-angle environmental sensing technology, and have important applications in image measurement. In order to project the largest possible scene onto a limited image plane, fisheye cameras are used to represent the projection of a spatial point that should be at infinity within a limited image plane, taking the camera's distortion as its image characteristic. The design of fisheye lenses adopts dissimilarity imaging, and in the process of imaging, the incident light undergoes different degrees of refraction and is projected onto an imaging plane of limited size. When the shooting position of the fisheye camera changes, nonlinear distortion is reported as it moves away from the center of the image. The degree of distinction of the same object in sequence fisheye images at different azimuth angles and distances is large, and especially in the case of close-up shooting, such characteristics can magnify the detailed information of the object to a certain extent, which is advantageous for measurement.

[0003] When the fisheye lens of the fisheye automatic analyzer measures the fisheye image, the film must be placed in the loading chamber located at the tip of the detection table, and then the detection table is pushed to the bottom of the detection part to perform detection. When the film is loaded in the loading chamber, it may wrinkle locally due to the flexibility and low rigidity of the film itself, which affects the accuracy of the fisheye detection of the film and reduces the accuracy of the detection result. Summary of the Invention [Problem to be solved by the invention]

[0004] The object of the present invention is to provide a fisheye image measuring device that solves the problem that when an automatic fisheye analysis device performs fisheye image measurement, it is necessary to place the film in a loading chamber located at the tip of the detection stand, and then the detection stand is pushed toward the bottom of the detection part to perform detection.When the film is placed in the loading chamber, the film itself may become wrinkled locally due to its flexibility and low rigidity, which affects the accuracy of fisheye detection on the film and reduces the accuracy of the detection results. [Means for solving the problem]

[0005] In order to achieve the above object, the present invention provides the following embodiment: The fisheye image measuring device according to the present invention includes a detection base having a detection component mounted at its tip for performing measurement and detection, a detection base for performing detection is slidably connected to the tip of the detection base, a mounting chamber for mounting a film is opened at the tip of the detection base, positioning components for reducing wrinkles in the film are symmetrically provided at both ends of the mounting chamber, the positioning components include adjustment slide grooves symmetrically provided at both ends of the mounting chamber, an adjustment rod slidably connected to the adjustment slide groove, and a connecting rod attached to one end of the adjustment rod, an extension rod for adjusting the length is slidably connected to one end of the connecting rod, a positioning rod is provided at the tip of the extension rod, a positioning block is attached to the positioning rod and passes through the extension rod, a first hollow groove is opened inside the extension rod, and a first return spring is attached inside the first hollow groove for returning the extension rod.

[0006] In another embodiment of the present invention, the adjustment slide groove is provided with a slide groove for adjusting the sliding of the adjustment rod, and the slide groove is opened symmetrically at both ends inside the adjustment slide groove, and slide blocks that slidably fit into the slide groove are symmetrically fixed to both ends of the adjustment rod.

[0007] In another embodiment of the present invention, the end of the connecting rod is provided with a limiting through hole for limiting the position of the extension rod, and each of the limiting through holes is evenly spaced at the end of the connecting rod, and a limiting plug rod that fits into the limiting through hole is connected to the end of the extension rod.

[0008] In a further embodiment of the present invention, a limiting part is provided at one end of the adjusting rod opposite the connecting rod to limit the position of the adjusting rod, the limiting part includes a link attached to one end of the adjusting rod, a sliding rod connected to the link through, and a limiting tooth block attached to the lower end of the sliding rod, limiting grooves are symmetrically opened at the tip of the detection base, and limiting tooth grooves that engage with the limiting tooth blocks are symmetrically opened inside the limiting groove.

[0009] In a further embodiment of the present invention, a second hollow groove is opened inside the link, and a second return spring is installed inside the second hollow groove for returning the slide rod.

[0010] In a further embodiment of the present invention, a push handle is attached to the end of the detection base, which facilitates an operator to push the detection component to the lower end, and the push handles are symmetrically attached to the end of the detection base.

[0011] In a further embodiment of the present invention, one end of the detection component, that is, one side of the detection stand, is provided with a light-shielding curtain for improving light-shielding performance. Effect of the Invention

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: In this utility model, the positioning parts can press and fix the four corners of the film, thereby reducing the situation in which the film itself's flexibility or low rigidity causes localized wrinkles in the film during detection, resulting in inaccurate detection results, and improving detection accuracy. In this utility model, a part of the external light source can be blocked by a light blocking curtain provided at one end of the detection component, so that the light source can be more concentrated during detection. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic diagram of the overall structure of the present invention. [Diagram 2] FIG. 2 is a partially enlarged schematic view of a portion A in FIG. 1 of the present utility model. [Diagram 3] FIG. 2 is a schematic diagram of the extension structure of the connecting rod and the extension rod in the present invention. [Figure 4] FIG. 2 is a schematic cross-sectional view of an extension rod in the present invention. [Diagram 5] FIG. 2 is a schematic cross-sectional view of a link in the present utility model. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, the technical solutions in the embodiments of the present utility model will be described clearly and completely with reference to the drawings in the embodiments of the present utility model, but of course, the described embodiments are only some of the embodiments of the present utility model, and not all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those skilled in the art without creative labor also belong to the protection scope of the present utility model.

[0015] In the description of the present utility model, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate a direction or positional relationship based on the direction or positional relationship shown in the attached drawings, and are used for the convenience and simplification of the description of the present utility model, and do not suggest or imply that the device or element has a specific direction, and should be configured and operated in a specific direction, and should not be understood as a limitation on the present utility model. Furthermore, the terms "first", "second", and "third" are used for explanatory purposes only, and should not be understood as suggesting or implying relative importance. In the description of the present utility model, unless otherwise clearly specified and limited, the terms "mounted", "coupled", "connected" and "installed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, or an indirect connection via an intermediate medium, or an internal communication between two parts. Those skilled in the art can understand the specific meaning of the above terms in the present utility model according to the specific situation. Hereinafter, an embodiment of the present invention will be described based on the overall configuration of the present invention.

[0016] 1 to 5, in this utility model, the fisheye image measuring device is provided with a detection base 1 having a detection part 2 attached to its tip for performing measurement and detection, a detection base 3 for performing detection is slidably connected to the tip of the detection base 1, and a mounting chamber 4 for mounting a film is opened at the tip of the detection base 3, and positioning parts 5 for reducing wrinkles in the film are symmetrically provided on both ends of the mounting chamber 4, and the positioning parts 5 are slidably connected to adjustment slide grooves 52, which are opened symmetrically on both ends of the mounting chamber 4. The film feed mechanism includes an adjustment rod 51 and a connecting rod 55 attached to one end of the adjustment rod 51, an extension rod 56 for adjusting the length is slidably connected to one end of the connecting rod 55, and a positioning rod 57 is provided at the tip of the extension rod 56. The positioning rod 57 passes through the extension rod 56 and has a positioning block 58 attached to it for positioning the film. A first groove 59 is formed inside the extension rod 56, and a first return spring 510 is attached inside the first groove 59 for returning the extension rod 56.

[0017] By adopting the above embodiment, when the fisheye image to be detected is fed into the lower end of the detection part 2, a nonlinear distortion function is established based on the selected projection model. The distortion of the fisheye image can be similarly expressed by a polynomial function, and then the coordinates of the extracted feature points are used to solve the intrinsic parameters, extrinsic parameters and distortion coefficients of the camera to obtain optimal camera parameters and distortion coefficients by minimizing an objective function such as the reprojection error. Then, a suitable feature extraction algorithm, such as SIFT (Scale Invariant Feature Transform) or MSER (Maximum Stable Extremal Region), is adopted to extract the feature points or feature regions of the target object in the fisheye image. In this case, based on the distortion model and the camera parameters, the dimensions, distance and orientation of the target object in the distorted fisheye image can be measured and calculated based on the triangulation measurement principle and the position of the target object in the image and the attitude information of the camera. The positioning block 58 is a rubber block with a certain degree of frictional performance, and the four corners of the film can be pressed and fixed by the positioning parts 5. This reduces the situation in which the film itself has a low flexibility or low rigidity, causing local wrinkles in the film during detection, resulting in inaccurate detection results, and improves the detection accuracy.

[0018] 1 to 5, the adjustment slide groove 52 is provided with a slide groove 53 for adjusting the sliding of the adjustment rod 51, and the slide grooves 53 are opened symmetrically at both ends inside the adjustment slide groove 52, and slide blocks 54 slidably fitted into the slide grooves 53 are fixed symmetrically to both ends of the adjustment rod 51. The end of the connecting rod 55 is opened with limiting through holes 511 for limiting the position of the extension rod 56, and the limiting through holes 511 are opened evenly at the end of the connecting rod 55, and the end of the extension rod 56 is connected to a limiting plug rod 512 that fits into the limiting through holes 511.

[0019] By adopting the above embodiment, the distance between the positioning blocks 58 can be adjusted according to different lengths of film by adjusting the slide groove 53 inside the slide groove 52 and the slide blocks 54 provided on both ends of the adjustment rod 51, making it easy to fix films of different lengths.

[0020] 1 to 5, a limiting part 6 for limiting the position of the adjustment rod 51 is provided at one end of the adjustment rod 51, opposite to the connecting rod 55, and the limiting part 6 includes a link 61 attached to one end of the adjustment rod 51, a slide rod 62 penetrating and connected to the link 61, and a limiting tooth block 63 attached to the lower end of the slide rod 62. Limiting grooves 66 are symmetrically opened at the tip of the detection base 3, and limiting tooth grooves 67 that fit with the limiting tooth block 63 are symmetrically opened inside the limiting groove 66. A second empty groove 64 is opened inside the link 61, and a second return spring 65 for returning the slide rod 62 is installed inside the second empty groove.

[0021] By employing the above embodiment, the limiting component 6 can limit and fix the link 61 when the adjustment of the adjustment rod 51 is completed. This reduces the possibility of the adjustment rod 51 accidentally sliding during detection, improving the stability of positioning.

[0022] 1 to 5, a push handle 7 that makes it easy for an operator to push the detection component 2 to the bottom end is attached to the tip of the detection stand 3, and the push handle 7 is symmetrically attached to the tip of the detection stand 3. A light-shielding curtain is provided on one end of the detection component 2, on one side of the detection stand 3, to improve light-shielding performance.

[0023] By adopting the above embodiment, the light shielding curtain 8 provided at one end of the detection component 2 can block a part of the external light source, so that the light source can be more concentrated during detection.

[0024] The working principle of this utility model is as follows. When detecting a fisheye image using the detection component 2, first, the slide rod 62 is pulled to slide inside the link 61 according to the dimensions of the film, and further, the limiting tooth block 63 is pulled out from inside the limiting tooth groove 67. After that, the adjustment rods 51 are pushed so that the intervals between the sets of adjustment rods 51 match the length of the film, and then the slide rods 62 are released, so that the second return spring 65 inside the second empty groove 64 in the link 61 is automatically returned, and the limiting tooth block 63 is automatically returned to the limiting tooth groove 67, and adjustment is completed. Next, according to the width of the film, the limiting rod 512 is pulled out from the limiting through hole 511 provided at the tip of the connecting rod 55, and then the extension rod 56 can be pulled to slide one end of the connecting rod 55. When adjustment is completed, the limiting rod 512 is reinserted into the limiting through hole 511 to complete the restriction. Films of different widths can be positioned by the connecting rod 55 and the extension rod 56. Next, the positioning rods 57 are pulled to place the film in the placement chamber 4 provided at the tip of the detection table 3 so that the four corners of the film are located directly below the sets of positioning rods 57, and then the positioning rods 57 are released, so that the first return spring 510 inside the first hollow groove 59 in the extension rod 56 automatically returns the positioning rods 57, and the positioning blocks 58 provided at the lower end of the positioning rods 57 can be pressed against the four corners of the film. Since the positioning parts 5 can press and fix the four corners of the film, the situation in which the film wrinkles locally due to the flexibility or low rigidity of the film itself during detection, resulting in inaccurate detection results, is reduced, and the accuracy of detection is improved. Next, the push handle 7 is pushed to push the detection table 3 directly below the detection part 2, and a part of the external light source can be blocked by the light-shielding curtain 8 provided at one end of the detection part 2, so that the light source can be more concentrated during detection.

[0025] What has been described above is merely a preferred specific embodiment of the present utility model, and the scope of protection of the present utility model is not limited thereto. A person skilled in the art may make equivalent substitutions or modifications within the technical scope disclosed in the present utility model based on the technical solution and the idea of ​​the present utility model, which should also be included in the scope of protection of the present utility model. [Explanation of symbols]

[0026] 1...detection base, 2...detection part, 3...detection base, 4...mounting chamber; 5...positioning part, 51...adjusting rod, 52...adjusting slide groove, 53...slide groove, 54...slide block, 55...connecting rod, 56...extension rod, 57...positioning rod, 58...positioning block, 59...first empty groove, 510...first return spring, 511...limiting through hole, 512...limiting rod, 6...limiting part, 61...link, 62...slide rod, 63...limiting tooth block, 64...second empty groove, 65...second return spring, 66...limiting groove, 67...limiting tooth groove, 7...push handle, 8, light-blocking curtain.

Claims

1. A fisheye image measuring device comprising a detection base (1) having a detection part (2) attached to its tip for performing measurement and detection, A detection table (3) for performing detection is slidably connected to the tip of the detection base (1), and a placement chamber (4) for placing a film is opened at the tip of the detection table (3), Positioning parts (5) for reducing wrinkles in the film are provided symmetrically on both ends of the loading chamber (4), and the positioning parts (5) include adjustment slide grooves (52) symmetrically opened on both ends of the loading chamber (4), an adjustment rod (51) slidably connected to the adjustment slide grooves (52), and a connecting rod (55) attached to one end of the adjustment rod (51); An extension rod (56) for adjusting the length is slidably connected to one end of the connecting rod (55), and a positioning rod (57) is provided at the tip of the extension rod (56); The positioning rod (57) passes through the extension rod (56) and is fitted with a positioning block (58) for positioning the film; A first groove (59) is provided inside the extension rod (56), and a first return spring (510) is installed inside the first groove (59) for returning the extension rod (56). A fisheye image measuring device comprising:

2. The adjustment slide groove (52) is provided with a slide groove (53) for adjusting the adjustment rod (51) so that the adjustment rod (51) can slide, and the slide groove (53) is opened symmetrically at both ends inside the adjustment slide groove (52), and slide blocks (54) that slidably fit into the slide groove (53) are fixed symmetrically to both ends of the adjustment rod (51).

2. The fisheye image measuring device according to claim 1 .

3. The connecting rod (55) has a limiting through hole (511) at the end thereof for limiting the position of the extension rod (56), and each of the limiting through holes (511) is evenly spaced at the end of the connecting rod (55); A restricting plug rod (512) that fits into the restricting through hole (511) is connected to the tip of the extension rod (56).

2. The fisheye image measuring device according to claim 1 .

4. A limiting part (6) is provided at one end of the adjustment rod (51) opposite to the connecting rod (55) to limit the position of the adjustment rod (51); The limiting component (6) includes a link (61) attached to one end of the adjustment rod (51), a slide rod (62) penetrating and connected to the link (61), and a limiting tooth block (63) attached to the lower end of the slide rod (62), The detection base (3) has a limiting groove (66) symmetrically formed at its tip, and a limiting tooth groove (67) that fits with the limiting tooth block (63) is symmetrically formed inside the limiting groove (66).

2. The fisheye image measuring device according to claim 1 .

5. A second groove (64) is formed inside the link (61), and a second return spring (65) for returning the slide rod (62) is installed inside the second groove.

5. The fisheye image measuring device according to claim 4.

6. A push handle (7) is attached to the tip of the detection table (3) to facilitate an operator's pushing the detection component (2) to the lower end, and the push handle (7) is symmetrically attached to the tip of the detection table (3).

2. The fisheye image measuring device according to claim 1 .

7. A light-shielding curtain is provided on one end of the detection component (2), on one side of the detection stand (3), to improve light-shielding performance.

2. The fisheye image measuring device according to claim 1 .

Images